Forced Induction Superchargers | Turbochargers | Intercoolers

vacuum for brake booster

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Old Oct 3, 2013 | 07:58 PM
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Default vacuum for brake booster

Hey turbo guys, I was wondering what you guys do with boost entering the brake booster? Do I need to install a check valve in the tube from the intake to the booster? i have weird brakes now on my trailblazer ss since the built motor/turbo went in.
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Old Oct 3, 2013 | 08:07 PM
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I've never used anything on my turbo cars. My brakes have always worked fine with the stock check valve in the booster. Did you change the cam ? Maybe it's not making enough vacuum.
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Old Oct 3, 2013 | 08:20 PM
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Originally Posted by Twin turbo c5
I've never used anything on my turbo cars. My brakes have always worked fine with the stock check valve in the booster. Did you change the cam ? Maybe it's not making enough vacuum.
it has a .605/.608 lift cam with 110 or 109 centerline, a cam that AES spec'd with my motor. it has brakes, then doesnt. its not constant.
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Old Oct 3, 2013 | 09:22 PM
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Do you have a vacuum gauge? How many inches of vacuum is that cam pulling.
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Old Oct 3, 2013 | 09:25 PM
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Originally Posted by Twin turbo c5
Do you have a vacuum gauge? How many inches of vacuum is that cam pulling.
12-13 in/hg. sometimes 15 for a second
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Old Oct 3, 2013 | 10:55 PM
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That should be enough vacuum for the power brakes to function. Have you tried bleeding the system?
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Old Oct 3, 2013 | 11:19 PM
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Originally Posted by 97WS6SCharged
That should be enough vacuum for the power brakes to function. Have you tried bleeding the system?
i never opened up the brake system, and was fine before the motor/turbo. the brake booster just does not recover fast enough after several brake applications.
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Old Oct 4, 2013 | 01:37 PM
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I always run a 1 way check valve on my setups. You might need a vaccum canister. I had to run one on my SBC that had a large cam and had the same issues. Pump it 2 or 3 times then it would drop almost to the floor with no pressure. I actualy still have that canister if you need one.
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